1. Combine all marinade ingredients in a small bowl. Add chicken cutlet pieces and mix well to coat evenly. Cover and place in fridge for at least a half hour.
2. Meanwhile, prepare sauce: Heat oil in a saucepan and sauté onions and garlic until golden, about 15 minutes. Add remaining ingredients and bring to a boil. Boil for two minutes and remove from heat.
3. Remove marinated chicken pieces from fridge. Heat a generous amount of oil in a large frying pan. Dip chicken pieces into potato starch and fry a few minutes on each side, until golden. Drain in a pan lined with paper towels. Repeat until all the chicken is used up.
4. Halfway through, preheat the oven to 350 degrees Fahrenheit (180 degrees Celsius). Place all the chicken pieces in a 9×13-inch aluminum pan. Pour sauce over chicken until pieces are evenly coated. Bake for a half hour, uncovered. You can cover it part of the time if you see that the sauce is getting completely absorbed.
If you like a lot of sauce with your chicken pieces, double the amount of sauce. You can also freeze it on its own and use with any chicken, meat, or even hamburgers.